1Heat oven to 375°F. Spray 12 regular-size muffin cups with cooking spray.
2In 10-inch skillet, heat oil over medium-high heat. Add onion, chiles, frozen corn and garlic; cook 5 minutes, stirring occasionally. Add oregano, salt, lime juice, beans and cilantro, stirring until combined. Remove from heat. Cool 5 minutes; stir in cheese.
3In medium bowl, stir baking mixture with whisk or fork until blended. Spoon 1 scant tablespoon baking mixture into each muffin cup. Top with about 1/4 cup veggie mixture. Spoon 1 tablespoon baking mixture onto veggie mixture in each muffin cup.
4Bake 30 to 35 minutes or until toothpick inserted in center comes out clean, and tops are golden brown. With thin knife, loosen sides of pies from pan; remove from pan and place top sides up on cooling rack. Cool 5 minutes, and serve with garnishes.